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| 型號(hào)： | 935166080118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計(jì)數(shù)器 |
| 英文描述： | LV/LV-A/LVX/H SERIES, ASYN NEGATIVE EDGE TRIGGERED 14-BIT UP BINARY COUNTER, PDSO16 |
| 封裝： | 5.30 MM, PLASTIC, MO-150AC, SOT-338-1, SSOP2-16 |
| 文件頁(yè)數(shù)： | 3/13頁(yè) |
| 文件大小： | 178K |
| 代理商： | 935166080118 |
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Philips Semiconductors
Product specification
74LV4060
14-stage binary ripple counter with oscillator
1998 Jun 23
11
SV00732
Ct
C2
R2
RS
11
Rt
RTC
CTC
10
9
MR (from logic)
Figure 3.
Example of an RC oscillator. Typical formula for oscillator frequency:
f
OSC +
1
2.5xRt xCt
SV00328
10–2 Ct (mF) 10–1
Rt (W)
103
10
102
103
105
104
fosc
(Hz)
10–4
104
10–3
105
106
Figure 4.
RC oscillator frequency as a function of Rt and Ct at
VCC = 1.2 to 3.6 V; Tamb = 25°C.
Ct curve at Rt = 100 kW; R2 = 200 kW.
Rt curve at Ct = 1 nF; R2 = 2 x Rt.
TIMING COMPONENTS LIMITATIONS
The oscillator frequency is mainly determined by Rt . Ct, provided R2 2Rt and R2 . C2 % Rt . Ct. The function of R2 is to minimize the
influence of the forward voltage across the input protection diodes on the frequency. The stray capacitance C2 should be kept as small as
possible. In consideration of accuracy, Ct must be larger than the inherent stray capacitance. Rt must be larger than the ’ON’ resistance in
series with it, which typically is 280
W at VCC = 1.2 V, 130 W at VCC = 2.0 V and 100 W at VCC 3.0 V. The recommended values for these
components to maintain agreement with the typical oscillation formula are: Ct > 50pF, up to any practical value, 10 kW < Rt < 1 MW. In order to
avoid start-up problems, Rt > 1 kW.
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